<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>ButtonAnimation</title>
    <style>
        .button
        {
            display: inline-block;
            border-radius: 4px;
            background-color: #ff6837;
            border: none;
            color: white;
            text-align: center;
            font-size: 28px;
            padding: 20px;
            width: 200px;
            transition: all 0.5s;
            cursor: pointer;
            margin: 5px;
        }

        .button span {
            cursor: pointer;
            display: inline-block;
            position: relative;
            transition: 0.5s;
        }

        .button span:after
        {
            content: ">>";
            position: absolute;
            opacity: 0;
            top: 0;
            right: 20px;
            transition: 0.5s;
        }

        .button:hover span
        {
            padding-right: 25px;
        }

        .button:hover span:after {
            opacity: 1;
            right: 0;
        }


    </style>
</head>
<body>

<button class="button" style="vertical-align: middle">
    <span>
        Hover
    </span>
</button>

</body>
</html>